docs: def sort_catalogue_chronologically(self):
          '''
          Sorts the catalogue into chronological order
          '''
          dec_time = self.get_decimal_time()
          idx = np.argsort(dec_time)
          if np.all((idx[1:] - idx[:-1]) > 0.):
              # Catalogue was already in chronological order
              return
          self.select_catalogue_events(idx)